Paint-spraying machine



Patented FRANK ,ABRAM YTITTE'MQRE, on, nicniironn, .c A'L rr'onNrA, Ass eivonro irorxins easily applied to and removed from the very simple for efifectingthe removal of the moisture from the fluid pressure medium bethrough the device OftlllSgiIlVGIltlOIl showing I, someofgthe parts in front-elevation. 40

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j asrRAY 'nourri'ann'r ,oo utsAnY; or SAN, rnnncrsco; oanrronnrn, A, oo PonArIoN V Qor NEVADA j y Application filed June 2, 1938:

machines which is simple in structure, eflicient in operation, compactxand foruse and application A further object of this invention is the provisionin a u'nitarystructure of means for use in a paint spraying machine for supplying fluid pressure to the paint'container' and convenient spray nozzle under controlled pressure conditions and'fo'r removing the moisture from the fluid pressure to prevent its mixing with the paint; W l A A further object ofthis invention is the provision of a structure of the aboveltype for de tachable' en'gagement with a paint pot by means'ofwhich all 'ofthe elements maybe paint pot as a unitary structure;

{A further object of'this invention is the provision of animproved structure which is fore it isadmitted to the paint pot.

These andzother objects as willappear from the following disclosure are secured by means "of the invention; 1

This invention resides substantially'in the combination, construction, arrangement and relative location ofparts all as will more fully appear hereinafter.

Referring to the drawings, Figure '1 ;is a vert cal cross-sectional View Figure 2 is a.crosssectionalview taken on I gure llook ng 1n the due:- tion of the arrows. I

- In theoperation of paint spraying a p i Y ratus employing: aspray gun for applylng the paint tov surfaces itis usualto'flfeed the paint'to thespray'gun from'a closed receptaole bysmeans of; fluid pressure and to supply v fluid pressure'tothe.paint gun for the puroseof atoinizingjthe paint and directing it upon-the surface to be covered. In thecor mmsmmmdaroma ff sur'esupplied to the paint container is'diflercnt in amount from the fluid pressureof'the medium suppliedto'the spray gun.

F urt'hermore, the amount: of the fluid pres-1 sure supplied tothe-paint container varies with the viscosity ofthe paintas Well as with rect operationofsuch a device the fluid presthe heightof thespra'yw gun above the level o'fthe paint in the container. The fluid presp to amount depending upon the degree of atom:

suresupplied to the sp'ray'gunvaneS in zation required, uponthe viscosityfof the paint,and upon the rate at which itis desired 1 toapply' the paint to thesurface. These and e other incidental) considerations require that the pressure of the medium supplied tofthe paint' container and to t'hespra'y gun must be under ready controlso that the correct operating conditions may he maintained. o

a It hasheen found in practice that themois 'ture wh ch iscondensedin the fluid pressure medium,-which is usually air, by reason of, the

- compression thereof, interferes with the proper operation "ofthe'apparatus if it is permitted to mixwiththe paint. Besides following the spraygun the moisture mixed 7 vwith the paint "preventsit from forming a e smooth oaton thesurface being covered. It

is the purpose of this invention to provide a simpie'structuml minty means of which the moisturegrnay be removed from the air before itreachesf the paint container and the spray gun and byme'ans of'which' the "pressure of the airjsuppliedtolthe container and the spray gun may be readily coordinated to in ratus.

i sure thecorr'ectopera'tion of the entire appa,

- Referring to the drawings which show one 7 form of device embodying the principles of,

this invention,-tl1ere isshown at 1 a-paintpot orcontainerhaving a removable ,plug 2 for closing-"and Y opening through which the o pai-ntmay be supplied to the container-4 -;The container is 'providedat the top with a screw threaded opening by meansof which the unit 3 comprising the features' of this invention is attached to the container, The unit is-providedf with a screw -threaded extension 4 r whichengages the threads of'the opening in the container "and by, means of which an air tight joint is made. The unit 3 is provided atits top with a threaded extension 5 intended to receive the internally threaded nut 7 which, together with the packing material 6, provides a packing gland around the rod 8 which extends through the nut 7 and the unit 5 so as to project into the container 1. The lower end of the rod 8 18 provided wlth a paddle or stirrer 9 by means of which the,

" red condition.

The upper portion of the unlt 3 comprises i a casing 10 which forms a chamber 11 be tween it and the inner sleeve through which ,the rod 8 passes. The inner wall of the easing 10 is providedwith a spiral groove 12. A threaded port 13 is provided in the wall otthe casing 10 which delivers into the spiral groove 12 on the interior of the casing. At 14 is shown a threaded opening near the bottom ofchamber 11 which is intended to receive the drain cook 15. Near the top of casing 10 to one side thereof isattached a nipple 45 which around the central sleeve in arcuate form.

his chamber 21 is'not in communication with chamber 29 which is of'similar construction to it. At 22is shown athreaded nipple by means of which the hose or oipe leading to the spray gun may be attached.

Another nipple 23 connects the chamber 11 near the top thereof with a second pressure reducing valve 24 having the control handle 25. As before a pressuregauge 26 gives a visual indicationefthe reduced pressure of the fluid pressure medium delivered from the valve. The outlet of valve 24 is connected to a T 27 which is united at one end by means of the pipe 28 with the chamber 29. This chamber 29 opens through a splash nozzle 30 into the interior of the container 1. The

other end of the T 27 is connected by means of a pipe 31 to a safety or blow o'fl valve 32.

. A description. of the invention in operation will be given The container 1 is supplied to a suitable height with the paint to be'sprayed through the opening in the container closed by the plug 2. From time to time the paddle 9 is moved to keep the paint correctly mixed.

The fluid pressure medium, usually air, is supplied to chamber 11 through the port 13. The air entering the port 18 at a high velocity travels spirally within the chamber 11 by means of the groove 12:tending to remain ntmay be maintained in its correctly through thepipes-l5 and23 to the pressure reducing valves 16 and'24,'respectively. The

air then passes through the pipes 20 and 28 to the chambers 2:2 and 29 respectively, with w rich they are in communication. The pressureot the medium delivered to these chambers is coordinated and regulated to the currect value by means of the pressure reducing valves 16 and 24. The gauges 18 and 26 give a visual indication of this pressure. The air supplied to chamber 29 is admitted to the container 1 through the splash nozzle 30. The paintzis then delivered under air pressure from the container 1 atany' suitable point, not sho n, to-thespray gun, all as is well known in this art; The air pressure supplied to chamber 21 is delivered through pipe to thespray gun by means of a hose or other suitable conduit. If, for anyreason, an excessive pressure should be built up in thecontainer 1 this pressure is relieved by means-fol" the safety valve 32 and the splash nozzle 30 is provided to prevent any paint escaping from the container 1 to thesafety valve. 7 a

It will be apparent from the foregoing disclosure that I haveprovided an improved unitary structure by means, of which air under the'proper pressure conditions may be supplied to the paint container and to the spray gun without permitting the admission of moisture to either. The device is also constructed so that the moisture may be collected at a point where it will do no harm and be removed from the apparatus from time to time.

I am well aware that many changes in the detail of construction'and relative association of parts will occur to those skilled in this art and I do not, therefore,desire to be particularly limited to the construction shown in p the drawings but rather to the scope of this inv .ition as it is definedbelow.

Having now set forth the objects and nature of my invention and a structure'embodying the principles thereof wh at I claim as new and useful and of my owninventionand desire to secure by United States Letters Patent is: p

1. in a paint spraying apparatus including a paint container the combination comprising combined pressure regulating and water separating. unit; comprising a chamber having means formed on the inner wall thereafter separating the moisturefrom the com pressed, air dehvered thereto, and adgustable l prising a unitary structure attachable to the pressure regulating devicessupported on and in communication with saidchamber. 7

2. In a paint, spraying apparatus employing a. paint container the combination comprising a detachable unitfor the COIitELlIlGIK constructed to form a chamber, said chamber having spiral'g'rooves on the interior wall from the chamber.

[3. In a paintspraying apparatus, includ-i thereof and a port opening into said spiral.

groove through which compressed air may be deliveredto, the chamber, and a drain cock at the bottom of the chamber for permitting the removal of the accumulated moisture ing a paint container, the combination coincontainer, arranged to form threeindependentchambers,'one of said chambers having aspiral groove on the inner 'Wall'thereof,

means-forming a passage from said chamber toeach of the other chambers,;said means includingfa' pressure regulating valve, and

means for providing communication between one of said chambers and the interior of the container.

. '4. In a paint spraying apparatus, having .a paint container, a combined pressure regulating andmoisture separating device coiii-- prising a single unit having three chambers, 7

one of said-chambers having a groove on the inner 'Wallthereof into which the moisture laden air is delivered under pressure, a drain cock in communication with said chamber near the bottom thereon, and conduits con necting said chamber with, each'of the other chambers, said conduitshaving pressure regu- ,spiralgroove on the inner wall thereof andfin alignment With-the upper end of the of said chamber. I

6. In a device as described, the combination comprising a member forming three chambers, one of said chambers having a a port opening tangentially into the chamber groove, a plurality of pressure regulating means supported on said member allof which commun cate with the chamber having the groove and'one of which communicates with one of the other chambers and the other of which communicates with the third chamber,

and a safety valve supported on said meinsaid chambershaving a spiral groove on the inner Wall thereof, and aport openingrtangentially into the chamber in alignment with tlieiup'per end of the groove, a plurality of pressure regulating means supported on said member all of which communicate with the chamber having the groove and oneof which communicates witlrone'of the other chambers and the other of which communicateswith theithird chambeij'said'third chamber being i i''coininunication with the paint container andasplash nozzle forming the communicating means.

' 8. Ina paint-spraying apparatus, including astr-uctural unit'detachably secured to a paintcontainer; for regulating the pressure medium and; separat ng the 'lIlOlSt-UTQ from the medium co n'prising the combination, of I 'a niember'having three chambers therein and central bore extending therethrough and opening intothe containerfmeaiis supported insaidlborefor stirring the contents offthe: container,'nieans formed on the inner wall of one of said; chambers for removing the moisture from the air'supplied theretoya; drain cock supported on said member forremoving the" moisture for said grooved chamber, means including pressure'i'egulating valves connecting said grooved chamber "with each of the other chambers, and a splash nozzle for connecting one of said chambers with the container. 1

9. In'a paint spraying apparatus,including a structural unit detachably secured to a v paint container for regulating the pressure medium comp 'ising the combination, of i a member having three chamberstherein and central bore" extending therethrough and 1 opening into the container, means supported in said bore for stirring thevconteiits of the container,- means formed on the inner wall of one "of'sai'd chambers for/removing the moisture from theair supplied thereto, a drain cock supportedon said member for removing the moisture for said grooved chamber,

means includingpressure regulating valves connecting said groovedchamber with each of the-other chambers, aspla'sh nozzle for connecting one ofthe chambers with said container of excess pressure through said splash nozzle whereby the liquid in the container'cannot escape through the pressure relievingmeans.I

In testimony-whereof I have hereunto set my hand on this 29th day of May A. D1928. FRANK TITTEMORE.

her and in communication with said third chamber; 7 1

'Z. In a paint spraying apparatus, including a paint container, a structural unit comprising a member forming three chambers, one of.

u u I i 7 medium and separating. the moisture from the a a 5 container, and means for relieving the paint 

